They are not 1/2 inch ISO couplers. They are a 3/8 Japanese style (for lack of a better term). Most manufacturers like Parker and Snaptite have them. Same couplers used on the OEM loader that may be mounted on the 1920. You can buy male tips to match with 3/8 NPT female fittings to connect to the hoses or buy 1/2 inch ISO female couplers and 1/2 x 3/8 reducing bushings rated for hydraulic pressures and be compatible with most other tractors. New Holland part 9846344 is the male tip 9846343 is the female coupler.
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/ What is the size of new holland 1920 remote male and female.